I think most of us would not take in a questionable character to stay at our home. He was lurking there, just waiting for the time to grab the kid. If the Dad had gone to the bathroom, or take a shower or take out the trash, the guy would have done it.
Thinking about it some more, if that crystal ball had been there, the father would have NEVER let this man stay with them...but he can't go back, and after the fact, it was a terrible lapse of good judgement, but he couldn't have known what was going to happen, no one could. I do feel sorry for him. sw